Only apply (update for draw) to border vertices

QTProject/subdivision.cpp

@@ -1144,12 +1144,22 @@ void Subdivision::updateIrregularForDraw(const QVector<Triangle> &triangles,QMap
         result.vertex_buffer_irregular[triangle.v_idx()] =  result.vertex_buffer.at(triangle.v_idx());
         result.vertex_buffer_irregular[triangle.w_idx()] =  result.vertex_buffer.at(triangle.w_idx());
 
+        bool uv_sharp = (triangle.get_sharpness_uv() > 0);
+        bool vw_sharp = (triangle.get_sharpness_vw() > 0);
+        bool wu_sharp = (triangle.get_sharpness_wu() > 0);
+
         Triangle::Neighbors ns = neighbors.value(triangle);
 
+        if (!(uv_sharp || wu_sharp)) {
             result.vertex_buffer_irregular[triangle.u_idx()].pos = updateIrregularVertexForDraw(triangle.u(), vertexNeighbors(triangle, ns.uv, neighbors));
+        }
+        if (!(uv_sharp || vw_sharp)) {
             result.vertex_buffer_irregular[triangle.v_idx()].pos = updateIrregularVertexForDraw(triangle.v(), vertexNeighbors(triangle, ns.vw, neighbors));
+        }
+        if (!(vw_sharp || wu_sharp)) {
             result.vertex_buffer_irregular[triangle.w_idx()].pos = updateIrregularVertexForDraw(triangle.w(), vertexNeighbors(triangle, ns.wu, neighbors));
         }
+    }
     qCDebug(log_timing) << "updateIrregularForDraw done:" << formatTimeMeasurement(timer.elapsed());
 }